[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly ... up to the motion controller upstream. The Arduino source for this can be found on the project ...

This solar tracker system uses the Arduino UNO board ... set the pins were the LDR are connected as INPUTs and position the servo motor at 90° then wait for a 2 seconds before the code execution ...

Stepper and servo motors have ... loop controlled. Which motor is better for load holding? How to make a submersible glider out of a water bottle, syringe, an Arduino, and a stepper motor.

An interesting Arduino project has been published to the Instructables website showing how an Arduino CNC shield and controller has been used to create an awesome 3 axis Arduino CNC plotter.